08Partner logo bar — a row that recomputes how many logos fit the current width

<main class="stage">
<section class="panel">
  <p class="hint">Every time the virtual screen width changes, it recalculates how many logos fit.</p>
  <div class="viewport" id="viewport">
    <ul class="row" id="row">
      <li class="logo" id="logo0">NoteGreen</li>
      <li class="logo" id="logo1">Bloomworks</li>
      <li class="logo" id="logo2">Ribbon Studio</li>
      <li class="logo" id="logo3">Gaon Square</li>
      <li class="logo" id="logo4">Dasol Works</li>
      <li class="logo" id="logo5">Byeolbit Lab</li>
    </ul>
  </div>
  <p class="chip" id="fitChip">0 shown</p>
</section>
</main>

@use "../../../../site/static/demo-tokens" as *;

$duration: $dur-base;
$easing: $ease-out;
$color: $subject-blue;

@include stage($stage-paper);

.panel {
  width: 100%;
  max-width: 440px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: $sp-2;
}

.hint {
  margin: 0;
  padding: 0 $sp-2;
  text-align: center;
  font-weight: 400;
  font-size: 11px;
  line-height: 1.4;
  color: rgba($subject-ink, .70);
}

.viewport {
  width: 220px;
  overflow: hidden;
  border-radius: $r-sm;
  background: rgba($subject-ink, .04);
  padding: $sp-2;
  transition: width $duration $easing;
}

.row {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  gap: $sp-2;
  flex-wrap: nowrap;
}

.logo {
  flex: 0 0 auto;
  width: 84px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: $r-xs;
  background: $subject-ink;
  color: $subject-cream;
  font-weight: 700;
  font-size: 9px;
  text-align: center;
  padding: 0 $sp-1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chip {
  margin: 0;
  padding: $sp-1 $sp-3;
  border-radius: $r-pill;
  background: $color;
  color: $subject-cream;
  font-weight: 700;
  font-size: 11px;
}

@media (max-width: 340px) {
  .panel { max-width: 300px; gap: $sp-1; }
  .hint { font-size: 9px; }
  .viewport { width: 180px; }
}

@media (prefers-reduced-motion: reduce) {
  .viewport {
    transition: none;
  }
}

html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffffff;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.panel {
  width: 100%;
  max-width: 440px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.hint {
  margin: 0;
  padding: 0 8px;
  text-align: center;
  font-weight: 400;
  font-size: 11px;
  line-height: 1.4;
  color: rgba(23, 20, 26, 0.7);
}

.viewport {
  width: 220px;
  overflow: hidden;
  border-radius: 8px;
  background: rgba(23, 20, 26, 0.04);
  padding: 8px;
  transition: width 300ms ease-out;
}

.row {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  gap: 8px;
  flex-wrap: nowrap;
}

.logo {
  flex: 0 0 auto;
  width: 84px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  background: #17141a;
  color: #fff7e6;
  font-weight: 700;
  font-size: 9px;
  text-align: center;
  padding: 0 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chip {
  margin: 0;
  padding: 4px 12px;
  border-radius: 999px;
  background: #2f6df6;
  color: #fff7e6;
  font-weight: 700;
  font-size: 11px;
}

@media (max-width: 340px) {
  .panel {
    max-width: 300px;
    gap: 4px;
  }
  .hint {
    font-size: 9px;
  }
  .viewport {
    width: 180px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .viewport {
    transition: none;
  }
}

// 파트너 바(08) — 가상 화면 폭(viewport)이 바뀔 때마다 로고 한 칸의 실제 폭(itemWidth)과 간격(gap)을
// 재 몇 개가 들어가는지(fitCount) 다시 계산하고, 그만큼만 보이게 한다(계산 한 겹). 마퀴가 아니라
// 정적 배치라 무한 루프 트랙 복제는 쓰지 않는다.
(function () {
  var viewport = document.getElementById('viewport');
  var row = document.getElementById('row');
  var chip = document.getElementById('fitChip');
  if (!viewport || !row || !chip) return;
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  var items = Array.prototype.slice.call(row.querySelectorAll('.logo'));
  if (!items.length) return;

  var GAP = 8;
  var WIDTHS = [220, 320, 420];

  function apply(width) {
    viewport.style.width = width + 'px';
    var itemWidth = items[0].offsetWidth || 80;
    var fitCount = Math.max(1, Math.floor((width + GAP) / (itemWidth + GAP)));
    fitCount = Math.min(fitCount, items.length);
    items.forEach(function (item, i) {
      item.style.display = i < fitCount ? '' : 'none';
    });
    chip.textContent = fitCount + 'shown';
  }

  apply(WIDTHS[0]);

  if (!reduce) {
    var idx = 0;
    setInterval(function () {
      idx = (idx + 1) % WIDTHS.length;
      apply(WIDTHS[idx]);
    }, 900);
  }
})();

// PricingPartnerBar — vanilla 판(run/339/demo/08-pricing-partner-bar/index.html) 의 React 포트.
// 가상 화면 폭(viewport)이 바뀔 때마다 로고 한 칸의 실제 폭(itemWidth)과 간격(gap)을 재 몇 개가
// 들어가는지(fitCount) 다시 계산하고, 그만큼만 보이게 한다(계산 한 겹). 마퀴가 아니라 정적 배치라
// 무한 루프 트랙 복제는 쓰지 않는다.
import { useEffect, useRef } from "react";
import styles from "./PricingPartnerBar.module.scss";

export type PricingPartnerBarProps = {
  duration?: string;
  easing?: string;
  color?: string;
};

const HINT = "가상 화면 폭이 바뀔 때마다 로고가 몇 개 들어가는지 다시 계산합니다";

const LOGOS = ["노트그린", "블룸웍스", "리본 스튜디오", "가온스퀘어", "다솔웍스", "별빛랩"];
const GAP = 8;
const WIDTHS = [220, 320, 420];

export default function PricingPartnerBar({
  duration = "300ms",
  easing = "ease-out",
  color = "#2f6df6"
}: PricingPartnerBarProps) {
  const viewportRef = useRef<HTMLDivElement | null>(null);
  const itemRefs = useRef<(HTMLLIElement | null)[]>([]);
  const chipRef = useRef<HTMLParagraphElement | null>(null);

  useEffect(() => {
    const viewport = viewportRef.current;
    const chip = chipRef.current;
    const items = itemRefs.current!;
    if (!viewport || !chip || items.some((el) => !el)) return;
    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;

    function apply(width: number): void {
      viewport!.style.width = width + "px";
      const itemWidth = items[0]!.offsetWidth || 80;
      let fitCount = Math.max(1, Math.floor((width + GAP) / (itemWidth + GAP)));
      fitCount = Math.min(fitCount, items.length);
      items.forEach((item, i) => {
        if (item) item.style.display = i < fitCount ? "" : "none";
      });
      chip!.textContent = fitCount + "개 표시 중";
    }

    apply(WIDTHS[0]);

    let timer = 0;
    if (!reduce) {
      let idx = 0;
      timer = window.setInterval(() => {
        idx = (idx + 1) % WIDTHS.length;
        apply(WIDTHS[idx]);
      }, 900);
    }

    return () => {
      if (timer) window.clearInterval(timer);
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  return (
    <main className={styles.stage}>
      <section className={styles.panel}>
        <p className={styles.hint}>{HINT}</p>
        <div className={styles.viewport} ref={viewportRef}>
          <ul className={styles.row}>
            {LOGOS.map((name, i) => (
              <li
                key={name}
                className={styles.logo}
                ref={(el: HTMLLIElement | null) => {
                  itemRefs.current![i] = el;
                }}
              >
                {name}
              </li>
            ))}
          </ul>
        </div>
        <p className={styles.chip} ref={chipRef}>
          0개 표시 중
        </p>
      </section>
    </main>
  );
}